Size: Diameter 10.8 - 11.2mm Inner circumference: 16.5cm The Japanese name for Chalcedony is "Gyokuzu" (玉髄). Healing effects of Chalcedony: ◎ Release from tension ◎ Ability to treat others with compassion and love ◎ Guides communication with others towards gentleness ◎ Builds comfortable relationships ◎ Supports good relationships ◎ Has a vibration that releases grudges Combined discounts are ¥200 off per item from the second item purchased. 2 items purchased: ¥200 off 3 items purchased: ¥400 off 4 items purchased: ¥600 off Thank you very much! ❣️